The summer solstice in 2025 will occur on Friday, June 20, marking the astronomical start of summer in the Northern Hemisphere. More specifically, it will happen at 10:42 PM EDT, which corresponds to 2:42 AM UTC on June 21, 2025 (or 3:42 AM BST).

For further details, you can refer to the following resources:

1. The Old Farmer's Almanac notes that summer begins with the solstice on June 20, 2025, which you can read more about here.
2. EarthSky provides insights into the June solstice, stating it will happen at 2:42 UTC on June 21 (9:42 PM CDT on June 20) here.
3. The Royal Observatory indicates that the summer solstice will occur at 03:42 BST, which can be found here.
4. Time and Date also confirms the solstice timing at 02:42 UTC, providing comprehensive seasonal information available here.
5. A calendar source states the same timing, where the solstice occurs on June 20, 2025, at 10:42 PM EDT, viewable here.

These sources collectively confirm the timing and details of the summer solstice in 2025.

Sources

Summer Solstice 2025: When Is The First Day of Summer?June solstice in 2025: All you need to know - EarthSkySummer solstice | Royal ObservatoryJune Solstice: Shortest and Longest Day of the Year - Time and DateWhen is Summer Solstice / Summer for the years 2025‑2035Seasons: Dates of Spring, Summer, Fall & Winter - Time and DateWhen is Summer Solstice 2025 - Calendarr

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